# Computed 2018-03-08 in GP/PARI CALCULATOR Version 2.9.4 (released) amd64 running mingw (x86-64/GMP-6.1.2 kernel) 64-bit version, compiled: Dec 20 2017, gcc version 4.9.1 (GCC), threading engine: single # with the following PARI-program: # # A003415(n) = {my(fac); if(n<1, 0, fac=factor(n); sum(i=1, matsize(fac)[1], n*fac[i, 2]/fac[i, 1]))}; \\ From A003415 # A300252(n) = -sumdiv(n,d,(d